Improvement in steam-gauges



Patenied July 26,1870.

Inventor,

ill!

- -J. P. HOLT.

Steam Gage.

dil'rerent' views.

1 slam "gaunt clam JO N P. HOLT, or-oLE-VELAND, OHIO.

aaa'pmt No. 105,685, dated July 26,1870.

' IMPROVEMENT m STEAM-canons.

The Schedule referred to in these Letters Patent and making part of the same Be it known that I, J OHN P, HOLT, of Olevelan'd; inthe countyot' Ouyahoga and State. of Ohio, have invented :a new and improved Steam- Gauge, of which the following is aspecih'cation.

Qrqwt'ng. I I Figure l'is a front view of-th-e gauge. Figure 2 a detached section. Like letters of referencoreferto like parts in the v Objective. I The nature of this hiventionrelatesto the packing or diaphragm covering the button attached to the lower end of a stem, whereby the mechanism of a steam-gauge is operatedby-the pressure of steam, ex-

erted upon said button and stem, as hereinafter more fully set forth.

- General'Descl'iption.

A represents the case or shell in which the mechanism of the gauge is secured, and which is, or may be,

of the ordinary description now in use.

B is the stem, to which the button '0 is attached, and upon which the steamexerts its pressure,

'Said-stem and button are fitted loosely in the stulf-i ing-box D, so that they may work freely therein for actuating the gauge. I

n order to prevent the steam from passing through the stufling-box, around the stemand button into the shell, a flexible. gasket. of rubber-,0!" other suitable material, is placed on over the underside of the bottom,

as shown at a, a detached view of which is shown in fig. 2.-

It is ket when heated, it sticks to the face of the button,

also, to the shoulders of the smiling-box, thereby 'obstructing the movement of the stem, sometimescausing a variation of several degrees in the action of the gauge. ,To avoid this difficulty, I place a shield of tin-foil, c, or other metal foil, between the button and the gasket, thereby preventing said gasket from adhering to the button, which will allow the stem to 'move freely to a variable pressure of the steam, and

iatthe same time make a steam-tight joint.

The toll shield may be placed on each side "of the diaphragm or gasket, but, under ordinary circumstances, one only is necessary when placed between the gasket and face of the button.

, Claim.

What I claim as my invention, and desire to secure by Letters Patent, is-' l V The foil shield c, in combination with the rubber diaphragm'or gasket a,- and button 0, of-a pressuregauge, in the manneras described, and for the purpose specified.

JOHN T. HOLT.

Witnesses:

W. H.- Bnnnmen, FRANK ALDEN.

found by experience that, in consequence of the adhesive nature'oi' the rubber diaphragm or gas- 

